Snubber



' May 11 1926.

C. E. BOONE SNUBBER Filed Feb. 28, 1925 3 Sheets-Sheet 1 May 11 ,1926.

C. E. BOONE SNUBBER 3 Sheets-Sheet 2 Filed Feb. 28,-1925 a a? BIHi'Or Clarence E. .Baane May 11 1926.

C. E. BOONE SNUBBER 3 Sheets-Sheet 5 Patented May 11, 1926.

UNITED STATES,

PATENT OFFICE.

cummcn n. IBOONE, or LONG BEACH, cnmronnm, nssronon ro nor A. many, or

' LONG BEACH, cnmronnm sun-Benn.

Application filed February 28, 1925. Serial No. 12,271.

This invention consists of the novel features herein shown, described and claimed.

The present invention is an -alternat ve construction or modification of the invention shown described and claimed in my companion application for snubbers filed Jan. 4, 1923, Serial No. 610,622.

An object is to make, a snubber which may be attached to the frame of a motor vehicle and'to a spring so as to allow the spring to yield and the frame go down, and so as to form a resistance to the recoil or rebound of the frame.

Another object is to make a snubber having a dash pot resistance, the dash pot construction being provided with a blowofi or relief valve to. come into operation under excess strain.

Other objects and advantages will appear from the drawings and specification.

The drawings illustrate the construction" 9 and operation of the present invention.

F1 re 1 is a side elevation showing the snub r in position for use u n the side bar and axle of a motor vehi e, the other parts of the vehicle being omitted.

' Fig. 2 is a to plan view in Fig. 1, the

frame being bro en away and parts being shown of section.

Fig. 3 is a fragmenta Y sectional elevation on an enlarged scale an on planes parallel with Fig. 1.

Fig. 4 is an irregular cros section on the line 4.4 of Fig. 3.

Fi 5 is an enlarged sectional detail on the line 5-5 of Fig. 3.

Fig. 6 is a perspective of the piston assembly. Fig. 7-7 of Fig. 3.

Fig. 8 is a fragmentary sectional detail on the line 88 of Fig. 3.

The details of construction and operation shown in the drawings are as follows:

The motor vehicle frame 1 has a wide vertical web 2 and u per. and lower flanges 3 and 4. The elliptic spring 5 is mounted upon an axle 6 and connected to the forward end of the frame 1 by a pin 7, and the rear end of the spring 5 is connected to the 7 is a sectional detail on the line frame 1 by links 8. So far as the frame 1 and spring 5 are. concerned, I have-selected this type simply :for the purpose of convenient illustration of the snubber.

The details of the snubbers are as follows:

The base 9 is circular in plan with attaching cars 10 and 11 extending outwardlydiametrically opposite each other in a horizontal plane and with clamping ears 12, 13, 14- and 15 extending outwardly and equally spaced apart. The back face 16 of the base is substantially flat with a central pad 17 extending a short distance back from the face 16 and having a flat back face and with pads 18 and 19'extending backwardly from the cars 10 and 11 and having fiat back faces parallel with the back faces of the ad 17 so that when the device is applied t e pad 17 fits against the front face 20 of the web 2 and bolts 21 and. 22 are inserted through the web 2 and through the ears 10 and 11 and nuts applied to secure the base carrying)the other parts securely to the web. no object in using pad 17 is to make restricted bearing surfaces which will fit the web 2, whereas if the web 2 was rough and the bearing surface covered the entire base there would not be a good fit. A short stub shaft 23 extends forwardly from the base 9 at its axial center. A slight hub 24 extends from the inner face of the base 9 concentric to the stub shaft 23, there being an annular groove 25 between the inner face of the hub and the periphery of the stub shaft, the groove having a flat bottom and straight sides. Flanges 26 and 27 extend forwardly from the front face of the base 9 at its extreme outer edge to form an annular groove 28., The attaching cars 12, 13, 14 and 15 have recesses 29 joining with the groove 28, the bottoms of the re cesses being flush with the bottom of the groove. A piston cylinder 30 is formed integral with the base 9 and extends for wardly, the piston cylinder being concentric to the stub shaft 23. The piston chamber 31 in the piston cylinder is circular in cross section and curved in plan, as in Fig. 3, and the chamber is wide open at the end 32 and, the opposite end of the chamber is closed by a web 33. The piston cylinder forms a part of the flange 27 so far as the cylinder extends and the closed end of the cylinder is in the vertical plane of the axis of the base and at the lower side.

A comparatively large port 34 is formed through the web 33. A ball 35 is placed in valve 39 has a hollow nipple 40 screwed through the web 33. The outer end of the nipple 40 is is flaring to form a ball valve seat 41. A ball 42 is placed against the seat, a casing 43 extends outwardly from the seat 41 and hasoutlet ports 44, a spring 45 is placed-in the casing against the ball 42, and a plug 46 is screwed into the outer end of the casing 43 against the spring 45. The tension of the spring 45 is sufficient to hold the ball 42 seated under ordinary piston pressure and is adapted to yield to allow the ball 42 to unseat in the case of excess strain.

A piston assembly 47 is mounted at the inner side of the base 9 with the piston in the piston chamber 31 and a cover 48 is placed in position to form a chamber 49. The, details of the piston assembly 47 are as follows:

A steel rock shaft 50 has a bore 51 extending from its inner end to fit the stub shaft 23. A .reenforcing plate 52 is fixed tight upon the rock shaft 50 near its inner end. A hub 53 is cast upon the inner end of the rock shaft 50 and around the reenforcing plate 52 and has a trunnion 54 fitting rotatably in the groove 25 and a similar trunnion 55 extending forwardly at the opposite end of the hub from the trunnion 54; A radial arm 56 extends from the hub 53 and a concentric piston rod 57 extends from the outer end of the arm 56 so that as the shaft 50 is rocked back and forth the piston rod 57 will move into and out of the piston cylinder 31. The reenforcing plate 52 may extend through the arm 56 and piston rod 57 to any desired extent. It is not necessary or desirable that the piston rod 57 should fit the cylinder 31. The piston 58 is a raw hide cup. A pad 59 extends from the end face of the piston rod '57 and is concentric to the periphery or axis and considerably smaller in diameter than the piston rod. The bottom face of the cup 58 fits against the pad 59. A washer 60 fits in the cup against the bottomand a cap screw 61 is inserted through the washer, through the center of the bottom of the cup 58, and tapped through the pad 59 into the so as to rest upon the pression'chamber 62 between the piston 58' and the web 33. 2

An annular flange 63 extends from the cover 48 inwardly and fits against the end of the hub 53 and around the trunnion 55.

Packing 64 is placed around the rock shaft 50 within the flange 63 against the end of the trunnion 55 and is compressed by the cover portion 65 fitting closely' around the shaft 50. Packing 66 is placed in the groove 28 and extends into the recess 29and the cover 48 has a rim 67 fitting against the packing 66 all the way around and has ears 68 fitting in the recesses 29. Cap screws 69 are inserted from the back side of the base 9 through the base and through the packing 66 and tapped to the ears 68 so that when the screws are drawntight the lower part of the chamber 49 is adapted to hold liquid 70 such as a suitable oil. Preferably the cap screws 69 are flat head screws and the heads are recessed into the back face of the base 9.

A cap screw 71 is tapped into the base 9 from the front side so that the head of the cap screw will form a stop to limit the backward movement of the radial arm 56,

the screw being inserted after the piston assembly has been a plied with the piston 58 in the piston cyinder 31 and the cap screw servin to prevent the complete withdrawal of t e piston 58 from the piston cylinder chamber 31.

The rock shaft 50 extends forwardly from the cover portion 65 and the crank arm 72 has a hub 73 fitting upon the outer end of the shaft 50 and held non-rotatably nupon the shaft by a key 74. A plate 75 fits against the end of the shaft 50 and against the front face of the hub'73 and is held in place by a cap screw 76. The arm 72 is offset backwardly' into a plane near the frame 1 and has an aperture formed in its outer end 77.

which receives a crank pin 7 8. The crank pin 78 is provided with a ball-she d head 79 which extends into a casing 80 living a. bore 81 formed therein extendi downward- 1 from the top thereof. A coi spring 82 is disposed in the bottom of the bore 81 and a cup-sha ed half bearing 83 rests upon this spring. n aperture 84 is formed in the side of the casing 80, which permits the ballshaped head 79 to be passed therethrough half bearing 85 is also disposed within the casing 80 and engages the top of the ball shaped head 79. This half bearing is provided with a threaded pin 86 which is threaded into a nut 87, which nut is threaded into the casing 80. A slot 88 is formed in alf bearing 83. A

the top of thenut and apertures 89 are formed in the casing 80 adapted to'reoeive llti tlll

Elli

a cotter pin disposed within theslot 88 to lock the nut in position. A rod 90 is threaded into the bottom of the casing 80 and is locked by means of a lock nut 91. The lower end of the rod 90 extends into a casing 92 which is similar in construction to the casing 80, and is locked in position there in by means of a lock nut 93. The casing 92 is provided with a bore in which there is disposed a spring and half bearings together with a nut similar to these elements in the casing80. A crank pin similar to the crank pin 78 is secured to a clamp 94 and is provided with aball-shaped head extending into the casing 92. The clamp 94. has a cooperating part 95 adapted to engage the opposite side of the axle 6 and these cooperating parts, forming the clamp, are secured together by means of a bolt 96 l and a nut 97. The rod 90 together with the casings 80 and 92 provide a resilient connection between the axle 6 and the crank arm 72. Adjustment may be provided by unscrewing or screwing the rod 90 and the casings 80 and 92 and locking the rod in adjusted position by means of the lock nuts 91 and 93.

In the practical operation when the spring yields, the frame 1 goes downwardly and the crank arm 72 swings upwardly and may continue the upward swing until the radial arm 56 strikes the stop 71. If there is further downward movement of the frame 1, the spring 81 will yield. This action withdraws the piston 58 from the web 33, the valve port 34 ppens and the chamber 62 is filled with oil. When the frame 1 rebounds or moves upwardly away -from the spring 5, the crank arm 7 2 is pulled downwardly, the piston 58 moves toward the web 33, the port 34: is closed by the ball 35, and the oil in the chamber'62 can only move through. the restricted opening 38, and this action holds the rebound. If the force of the rebound is excessive, the blowofl valve 39 will open and relieve the pressure in the chamber 62. The port 34 is comparatively large to provide a tree flow of oil into the chamber 62 upon the withdrawal of the piston 58 and theoutlet port 38 is very small to provide a limited of the oil from the chamber 62 under the action of the rebound of the motor vehicle.

The base 9 with all its parts is preferably a steel die casting. The piston assembly 4:7 is steel die casting with. the exception of the piston 58. lhe steel rock shaft with the reenforcing plate 52 is mounted in the mold and the hub the radial arm 56 and the piston rod 5? die cast upon the shaft and reentorcing plate. The cover a8 is die cast.

The result is perfect fitting parts with little or no machine work. K

Various changes may be made without departing from the spirit of the invention as claimed.

I claim:

1. In a snubber, a reservoir chamber, a piston chamber, a piston movable in said piston chamber, an inlet check valve for the piston chamber, a restricted outlet port leading from the piston chamber, and a blowofi' lZglve communicating with the piston cham- 2. In a snubber, a reservoir chamber, a piston chamber, a piston in the piston chamber, an inlet check valve leading into the piston chamber, the check valve being at the bottom of the reservoir chamber, and there being a restricted outlet port near the check valve and leading from the piston chamber and a blowofi' valve leading from the piston chamber.

3. In a snubber, a base, a cover attached to the base and forming a reservoir chamber, a piston cylinder formed integral with the base, an inlet check valve for the piston cylinder and at the bottom. of the reservoir chamber, there being a restricted bleed port from the piston cylinder, and a blowoii valve leading from the piston cylinder.

4:- ln a snubber, a base, a cover secured to the base and forming a reservoir chamber, a rock shaft extending into the chamber, a radial arm extending from the rock shaft in the chamber, a concentric piston rod ex-' tending from the radial arm, a piston upon the outer end of the piston rod, a piston chamber in which the piston operates, an inlet valve for the piston chamber and at the bottom of the reservoir chamber, and a blowofi? valve for the piston chamber,"there being a restricted outlet port leading from the piston chamber.

5. ln a snubber, a die cast base having an annular groove, a packing in the gnoove, a die cast cover having a rim fitting in the groove against the packing, means for corn necting the cover to the base, thereby forming a reservoir chamber, a piston chamber in the reservoir chamber, a piston in. *the llll piston chamber, and means for operating the piston.

6. lln a snubber, a piston assembly comprising a steel shaft, a reenforcing plate fixed upon one end of the steel shaft, and a hub, radial arm and piston rod die cast upon and around the rock shaft and reeniorcing plate.

lln testimony whereof l have signed my name to this specification.

CLARENCE E. BOUNE.

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